Drill-rotating mechanism for percussion-hammers.



E.-L. UPSON & H. w. PLEISTER. DR ILL ROTATING MECHANISM FOR PERCUSSIONHAM q MERS. APPLICATION FILED APR. 3. 1913. 1,163,712.

Patented Dec. H, 191:3.

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EDWIN L. UPSON, OF BROOKLYN, NEW YORK, AND HENRY W. PLEISTER, OF WEST-FIELD, NEW JERSEY, ASSIGNORS TO HENRY B. NEWHALL, 0F PLAINFIELID, NEW

JERSEY.

iDBILL-ROTATING- MECHANISM FOR PERCUSSION-HAMMERS.

Application filed April 3, 1913.

To all whom it may concern:

Be it known that we, Enwrx L. UPSON, a citizen of the United States,residing at Brooklyn, in the county of Kings and State of New York, andHENRY \V. PLnis'rEn, a citizen of the United States, residingat'Westfield, in the county of Union and State of New J erse haveinvented certain new and useful Improvements in Drill-Rotating Mechanismfor Percussion-Hammers, of which the following is a specification. I

Our present invention relates to an 1mprovement in cutter or drillrotating mechanism as applied to percussion hammers of the typedescribed in our co-pending application, Serial No. 719,735, filed Sept.11, 1912. One important advantage of the application of this rotatingmeans to percussion drills of the above noted type, is that the cutteror drill is rotated a certain predetermined amount simultaneously witheach reyolution of the cam disk, thereby increasing the. elliciency ofthe cutting or boring capacity of the tool when in use as a. rock drill.

In the accompanying drawing, Figure 1 is a sectional view of a portionof our device taken on the line ll of Fig. 2; Fig. 2' is a sectionalview taken on line 22, Fig. 1, looking in the direction of the arrows;and Fig. 3 is a sectional view on line 3-3, Fig. 1.

In Figs. 1 and 2 there is shown enough of the important elements of .ourdevice to indicate the application of the improvement. The cam oractuating disk 8 is rotatably mounted-upon a main bearing shaft 2, whichis suitably, supported in a housing 3, and which is shown broken away inFig. 2. The said housing has a tubular extension 4 in which is arrangeda reciprocating cylindrical hammer 5. The said hammer has at its upperend a slot 6 which is arranged in such a manner as to be in the path ofthe cam extensions 7 that are arranged on the rotating disk 8, and asthe said cams 7 pass through the said slot they cause the hammer to belifted upwardly. When the said cam has left the slot, the hammer is thenfree to be forced downwardly under the tension of a spring member 9,which is in engagement with the upper end of the said hammer at one endand attached to a portion of the housing Wall, as at 10, at itsSpecification of Letters Patent.

Patented Dec. id, 1915.

Serial No. 758,656.

other end by such suitable means as a Stud 11, as lndicated in Fig. l.

Arranged at the lower end of the tubular extension -l is a suitablecollet or chuck 12' end of this chuck 12 is flanged as at 15 and is inrotatable engagement with the walls of the chamber 16 formed at thelower end of the extension l. A. threaded lock-nut or bushing 17 isarranged. in such a manner in the lower part of the extension 4 as tomaintain the said collet 12 in operative alinement with the hammer 5 andat the same time permit a slightly limited motion therein, as indicatedby the clearance 18.

An extension of the aperture 13 at the upper end of the collet 12 isarranged in a tapered rectangular manner as indicated at 19, to engagewith a square faced tapered shank portion 20 of a driving shaft 21 whichextends down through. the center of the ham mer 5, the upper end of thesaid shaft being suitably mounted for rotation in a bearing block 22,said shafthaving arranged adjacent the said block a driven bevel gear2;}, and on the opposite side of said bearing a taining collar 2l. Itwill be noted tha the shaft- 2 is formed in such a manner as to be anextension of the said bearing block 22, as indicated in Fig. 3, and atthe end opposite to the said shaft, is arranged a threaded stud portion25, so that in assembling the hammer the said bearing supports'therotating disk 8 and the drill rotating shaft 21 in proper workingalinem'ent by reason of being attached to the back wall of the housing 3by means of thesaid threaded stud portion and a lock-nut 26. Arranged onthe said driving disk, 8, either cast or otherwise secured thereon, is adriving bevel gear 27 corresponding with and adapted to drive the drivengear 23, and as indicated in Figs. 1, and 3, this bevel gear is indriving engagement with the first mentioned bevel gear 23, so that whenthe disk 8 is rotated by a hand crank or any other suitable means, notshown, but which may be suitably affixed to the hub portion 28 of thesaid disk 8, the shaft 21 is caused to rotate and at the same time thehammer is retracted and released by the cams on the said disk 8,

thereby slowly rotating the drill and at the same time causing thehammer to operate to strike the drill through its attached holdingbushing or collet 12., p

In use, the tool is pressed against the work and the shaft 21 and chuck12 are angularly firmly engaged, and rotate as one piece; but whenever ablow is struck they are slightly separated by the advance of the chuckand tool and the recoil of the housing 3 and shaft 21. If the taper ofthe engaging chuck socket and shaft head be suflicient, such separationgives to the chuck and tool therein a dwell sufficient to cause the saidtool to function properly. It will be noted that such tapered engagementhas the practical utility of an intermittent gearing between the camdisk and the chuck; and that the shaft 21, owing to its being held inalinement by the bushing 12 and the bearing block 22, acts as a slidebar and guide for the reciproeating hammer member 5.

While not necessary, it is sometimes desirable to have the intermittentstop period coincide with the moment of impact of the hammer with thecutting drill which obviously can be accomplished by changing the timingof the angular head 20, the portion 19 of the collet l2, and the gears23 and 27 relative to one another. It is also advantageous, in cuttingstone, to arrange that the degree of rotation of the drill varies eachrevolution in such a manner as to preclude, in the well known type offour lipped drill, the striking of the drill points at the same positionat each revolution which likewise can, with facility, be accomplished byprop-' erly changing the timing of the angular head 20, the portion 19of the collet 12, and the gears 23 and 27 relative to one another. Thislatter arrangement, in other words, would cause the drill to cut at adifferent angular degree in the second revolution than it did in thefirst revolution, and this change of cutting contact is progressive orretrogressive accordingly as the drill makes more'than a completerotation or less than a complete rotation between successive hammerimpulses.

The above noted change of cycle of drill may be regulated by havingdifferent pitch diameters of the operating gears, as in hunting toothgears, and as may be ascertained by comparing those (23 and 27) shown inFig. 2. For instance, as there are six cams on disk 8, there might betwelve teeth on gear-23, and only eleven teeth on gear 27.

i This arrangement would therefore cause the loss of degree ofrevolution of the drill equal to onetooth each revolution. Conversely,if gear 27'had twelve teeth and gear 23 eleven teeth, the drill would becorrespondingly advanced one tooth each revolution, and thisdifferential variation of rotation would prevent the impact of the drilloccurringat the same spot in successive revolutions.

Having thus described our invention, we claim 1. A housing; a tubularextension thereof on a percussion axis and terminating in a chuckmounting; revolubly mounted with axial play therein, a tool-chuck formedwith an axial, tapered engagement socket; a'hammer operable in saidextension to strike said chuck, means for intermittently retracting saidhammer, a shaft rotatably mounted in said housing and thereon a tapered,terminal head adapted to engage and rotate said chuck; a gearingoperably connecting said shaft and retracting means to rotate saidchuck. v

2. A housing, a tubular extension thereof terminating in a chuckmounting, a toolchuck revolubly mounted in said housing with axial play,a hammer operably mounti ed in said .extension to strike said chuck,

means operatively connected to intermittently retract said hammer, meansfor maintaining a chuck-striking tension on said hammer, a shaftrevolubly mounted in said housing, gearing connecting the upper end ofsaid shaft with said retracting means, and an angular head at the lowerend of said shaft, there being an angular socket in said chuck to beengaged by said angular head by means of which the chuck will be rotatedby said shaft.

3. A housing, a tubular ext nsion thereof and terminating in a chuckmounting, a toolchuck revolubly mounted in said housing, a shaftextending through'said housing, a

tubular hammer operably mounted in said extension to strike said chuck,means loosely mounted on said shaft and operatively connected tointermittently retract said hammer, means for maintaining achuck-striking tension on said hammer, a second shaft extending throughsaid tubular hammer and which the chuck will be rotated by said secondshaft.

. EDWIN LUPSON. HENRY w. PLEISTER.

. Witnesses: FRED. J. Dona,

Jomv Mourns.

